A fire engine emits at 1550 Hz. If it moves at 25 m/s towards a person at rest, what frequency would the person hear?
A fire engine emits at 1550 Hz. If it moves at 25 m/s towards a person...
The siren of a fire truck at rest emits at a predominant frequency of 1950 Hz. What frequency will you hear if you are at rest and the fire truck car moves at 20.5 m/s (a) toward you? The temperature of that day is 20°C so use Vsound 343 m/s. Please submit your answer with the correct number of significant figures and the corresponding units
The siren of a fire engine that is driving northward at 32.0 m/s emits a sound of frequency 2120 Hz . A truck in front of this fire engine is moving northward at 20.0 m/s .What wavelength would this driver measure for these reflected sound waves?
The siren of a fire engine that is driving northward at 30.0 m/s emits a sound of frequency 2020 Hz. A truck in front of this fire engine is moving northward at 17.0 m/s. What is the frequency of the siren's sound that the fire engine's driver hears reflected from the back of the truck? What wavelength would this driver measure for these reflected sound waves?
The siren of a police car at rest emits at frequency of 1600 Hz. What frequency will you hear if you are at rest and the police car moves at 25 m/s toward you. Assume T air= 20 degrees C, v=343 m/s ANS: f'=1725.8
6.) A person holding a 325 Hz tuning fork walks towards a wall at 1.33 m/s. What beat frequency is heard by the person due to the difference in frequency of the tuning fork and its echo off the wall? (Hint: The person is a moving source, but they still hear the tuning fork at the original frequency). (2.5 Hz)
The siren of a fire engine that is driving northward at 30.0m/s emits a sound of frequency 2000Hz . A truck in front of this fire engine is moving northward at 21.0m/s .
You are driving and pull over when you hear a fire-engine approaching. The difference between the frequency you hear when the fire-engine is approaching and the frequency of the siren on the fire-engine is 47.3 Hz. The siren on the fire-engine has a frequency of 635 Hz. How fast is the fire-engine travelling? Enter your answer in m/s.
An eagle flying at 37 m/s emits a cry whose frequency is 490 Hz. A blackbird is moving in the same direction as the eagle at 13 m/s. (Assume the speed of sound is 343 m/s.) (a) What frequency does the blackbird hear (in Hz) as the eagle approaches the blackbird? Hz (b) What frequency does the blackbird hear (in Hz) after the eagle passes the blackbird? Hz
Initials 4. A car, moving at 50 m/s towards a person honks its horn. The person is running away from the car at 20 m/s. The bank thermometer shows 5°C. The person hears the hom at 2000 Hz. What is the actual frequency of the horn? Assume the car passes the person without a collision and both objects continue in the same direction. What frequency does the person hear as the car continues away from them? 20 m/s 50 m/s
Let the speed of sound be 340 m/s. A source emits a sound of 327 Hz. It is moving towards the right with a speed of 39 m/s and approaching an observer who is moving towards the left with a speed of 36 m/s. What is the frequency heard by the observer? Enter an integer.